Without prejudice to Article 4, there shall be no direct or indirect discrimination on grounds of sex in occupational social security schemes, in particular as regards:
(a)
the scope of such schemes and the conditions of access to them;
(b)
the obligation to contribute and the calculation of contributions;
(c)
the calculation of benefits, including supplementary benefits due in respect of a spouse or dependants, and the conditions governing the duration and retention of entitlement to benefits.